Question

我的应用程序的用途： 我已经为我的网站实现了facebook登录。我想从Facebook图形api中保存一些用户信息，我将通过Json获得响应。

我的问题： 我能够从json response 打印一些Individual值，但无法打印嵌套在数组中的值。如何从json响应中打印子值？

       *Please see my code below. There i am able to print users info like name and id.
         But unable to get the location of  user from json response.*

Json输出：

        --responseBody---{"id":"100003645579131","name":"Ashutosh Singh","first_name":"Ashutosh","location":{"id":"106377336067638","name":"Bangalore, India"}}
        ---json---{"work":[{"position":{"id":"140001066034322","name":"Senior Inspector"},"location":{"id":"106377336067638","name":"Bangalore, India"},"name":"Ashutosh Singh","last_name":"Singh","gender":"male"}

我的代码打印以上值：

String newUrl = "https://graph.facebook.com/me?access_token=" + accessToken;
            httpclient = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(newUrl);
            System.out.println("Get info from facebook --> executing request: "+ httpget.getURI()); 
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String responseBody = httpclient.execute(httpget, responseHandler);
               System.out.println("--responseBody---"+responseBody);
            json = (JSONObject) JSONSerializer.toJSON(responseBody);
            System.out.println("---json---"+json);
            facebookId = json.getString("id");//this values are printing fine
            String firstName = json.getString("first_name");//this values are printing fine
            String lastName = json.getString("last_name");//this values are printing fine

            String location=json.getJSONArray("location").toString(); //Unable to print information. Plz give help me. I want to print the location name from the json results.

            System.out.println("locale:"+location); //Unable to print

错误消息：

javax.servlet.ServletException: net.sf.json.JSONException: JSONObject["location"] is not a JSONArray.
            org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:520)
            org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:427)
            org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
            org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
            org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        root cause

        net.sf.json.JSONException: JSONObject["location"] is not a JSONArray.
            net.sf.json.JSONObject.getJSONArray(JSONObject.java:1793)
            com.ebhasin.bstalentscareers.action.SecurityServlet.getUserMailAddressFromJsonResponse(SecurityServlet.java:88)
            com.ebhasin.bstalentscareers.action.FacebookLoginAction.execute(FacebookLoginAction.java:45)
            org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
            org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
            org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
            org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Answer 1

从JSON可以看出，location不是JSON数组，而是JSON对象。您正在使用getJSONArray（）来检索它。改为使用getJSONObject（）。

如何从Facebook json响应中获取单个值

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